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    Current & Voltage Monitors

    Big Bear Instruments offers a wide variety of current monitors and phase/voltage monitors.  The current monitors are used to do just that -monitor current in its necessary application.  Many units can detect over and/or under current too which is important for avoiding an issue with continuous operation of critical industrial machinery. The phase/voltage monitors are designed to protect applications from things like phase loss, under or over voltage, and machine failure.  Sort by manufacturer, series, monitor type, or part number.

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    ATC Diversified Electronics SLA-380-ASA Voltage Monitor

    SLA-380-ASA
    • Operating Voltage: 350-440 Adj.
    • Type of Operation: Screwdriver Adjusted
    • Enclosure Style: Octal Plug-In Dust Cover
    $362.33

    ATC Diversified Electronics SLA-440-AFE Voltage Monitor

    SLA-440-AFE
    • Operating Voltage: 440
    • Type of Operation: Fixed
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    $407.61

    ATC Diversified Electronics SLA-440-ALE Voltage Monitor

    SLA-440-ALE
    • Operating Voltage: 440
    • Type of Operation: Lock Shaft Adjusted
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    $326.09

    ATC Diversified Electronics SLA-440-ALER Voltage Monitor

    SLA-440-ALER
    • Operating Voltage: 440
    • Type of Operation: Lock Shaft Adjusted
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    • Reset: Manual
    $555.57

    ATC Diversified Electronics SLA-440-ASA Voltage Monitor

    SLA-440-ASA
    • Operating Voltage: 430-480 Adj.
    • Type of Operation: Screwdriver Adjusted
    • Enclosure Style: Octal Plug-In Dust Cover
    $159.42

    ATC Diversified Electronics SLA-460-AFE Voltage Monitor

    SLA-460-AFE
    • Operating Voltage: 460
    • Type of Operation: Fixed
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    $468.27

    ATC Diversified Electronics SLA-480-AFE Voltage Monitor

    SLA-480-AFE
    • Operating Voltage: 480
    • Type of Operation: Fixed
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    $585.33

    ATC Diversified Electronics SLA-575-ALE Voltage Monitor

    SLA-575-ALE
    • Operating Voltage: 525-625 Adj.
    • Type of Operation: Lock Shaft Adjusted
    • Enclosure Style: Surface Mounted
      #8 Screw Terminals
    $585.33

    ATC Diversified Electronics SLB-400-ALEA Phase Unbalance Monitor

    SLB-400-ALEA
    • Operating Voltage: Standard Automatic 10% of Unbalance 300-500; Setting 3 Ø Line Voltages 60 Hz
    • Reset: Automatic
    • Hysteresis: 10% of Unbalanced Setting
    $370.99

    ATC Diversified Electronics SLC-120-ALE Phase Unbalance & Loss Monitor

    SLC-120-ALE
    • Operating Voltage: 120 VA
    • Power Required: 3 VA Max
    • Output Rating: DPDT
      5 Amps
      Resistive; 345 VA
      Inductive @ 240 VAC
    $318.89

    ATC Diversified Electronics SLC-230-ALE Phase Unbalance & Loss Monitor

    SLC-230-ALE
    • Operating Voltage: 208/240 VAC
    • Power Required: 3 VA Max
    • Output Rating: DPDT
      5 Amps
      Resistive; 345 VA
      Inductive @ 240 VAC
    $318.89

    ATC Diversified Electronics SLC-380-ALE Phase Unbalance & Loss Monitor

    SLC-380-ALE
    • Operating Voltage: 380 VAC
    • Power Required: 7 VA Max
    • Output Rating: DPDT
      3 Amps
      Resistive; 360 VA
      Inductive @ 600 VAC
    $380.83

    ATC Diversified Electronics SLC-440-ALE Phase Unbalance & Loss Monitor

    SLC-440-ALE
    • Operating Voltage: 440/480 VAC
    • Power Required: 7 VA Max
    • Output Rating: DPDT
      3 Amps
      Resistive; 360 VA
      Inductive @ 600 VAC
    $476.04

    ATC Diversified Electronics SLD-120-ASA Phase & Under Voltage Monitor

    SLD-120-ASA
    • Operating Voltage: 120 VAC
    • Under Voltage Dropout Range: 95-115 Adj.
    • Power Required: 3 VA Max
    • Output Rating: SPDT
      10 Amp
      Resistive @ 240 VAC; 1/2 HP @ 240 VAC
    $299.57

    ATC Diversified Electronics SLD-230-ALE Phase & Under Voltage Monitor

    SLD-230-ALE
    • Operating Voltage: 208/240 VAC
    • Under Voltage Dropout Range: 185-230 Adj.
    • Power Required: 3 VA Max
    • Output Rating: DPDT
      5 Amps
      Resistive; 345 VA
      Inductive @ 240 VAC
    $668.28

    ATC Diversified Electronics SLD-380-ALE Phase & Under Voltage Monitor

    SLD-380-ALE
    • Operating Voltage: 380 VAC
    • Under Voltage Dropout Range: 315-390 Adj.
    • Power Required: 7 VA Max
    • Output Rating: DPDT
      3 Amps
      Resistive; 360 VA
      Inductive @ 600 VAC
    $534.62

    ATC Diversified Electronics SLD-380-ASA Phase & Under Voltage Monitor

    SLD-380-ASA
    • Operating Voltage: 380 VAC
    • Under Voltage Dropout Range: 315-390 Adj.
    • Power Required: 3 VA Max
    • Output Rating: SPDT
      10 Amp
      Resistive @ 240 VAC
      1/2 HP @ 240 VAC
    $534.86

    ATC Diversified Electronics SLD-440-ALE Phase & Under Voltage Monitor

    SLD-440-ALE
    • Operating Voltage: 440/480 VAC
    • Under Voltage Dropout Range: 370-460 Adj.
    • Power Required: 7 VA Max
    • Output Rating: DPDT
      3 Amps
      Resistive; 360 VA
      Inductive @ 600 VAC
    $488.13

    ATC Diversified Electronics SLD-440-ASA Phase & Under Voltage Monitor

    SLD-440-ASA
    • Operating Voltage: 440/480 VAC
    • Under Voltage Dropout Range: 370-460 Adj.
    • Power Required: 3 VA Max
    • Output Rating: SPDT
      10 Amp
      Resistive @ 240 VAC
      1/2 HP @ 240 VAC
    $534.86

    ATC Diversified Electronics SLU-0200 Voltage Monitor

    SLU-0200
    • Universal Phase Monitor with Rapid Cycle Lockout
    • Enclosure Style: 8-Pin Plug In LEXAN® Dust Cover
    $146.22
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